Polishing systems
View Patent ↗Described herein are polishing apparatus, polishing formulations, and polymeric substrates for use in polishing surfaces, and related methods. The apparatus, formulations, substrates, and methods may each be used in applications involving the polishing of metal and/or metal-containing surfaces such as semiconductor wafers. The apparatus, formulations, polymeric substrates, and related methods described herein may be used without abrasives, and in some instances, without mechanical friction of a pad surface against the surface to be polished. Therefore, defects on a polished surface due to such mechanical polishing processes may be reduced.
1. A method for polishing a metallized surface of a polish substrate, the method comprising:
contacting the metallized surface with a latent boundary layer released from a porous polymeric surface of a polymeric substrate below the polish substrate when a downward force is applied to the porous polymeric substrate;
forming metal cations from metal or metal-containing species on the metallized surface;
solvating the metal cations with an external aqueous phase of a polishing formulation; and
extracting solvated metal cations from the external aqueous phase with an organic phase of the polishing formulation,
wherein at least one of the external aqueous phase and the organic phase is capable of permeating the porous polymeric surface of the polymeric substrate.
2. The method of claim 1 , comprising extracting solvated metal cations from the external aqueous phase at least partially within a body of the polymeric substrate below the porous polymeric surface.
3. The method of claim 1 , comprising permeating the organic phase through the porous polymeric surface to contact the external aqueous phase.
4. The method of claim 1 , comprising permeating the external aqueous phase comprising solvated metal cations through the porous polymeric surface to contact the organic phase.
5. The method of claim 1 , further comprising agitating at least one of the external aqueous phase and the organic phase relative to the polish substrate.
6. The method of claim 1 , further comprising moving at least one of the polymeric substrate and the polish substrate relative to the other of the polymeric substrate and the polish substrate.
7. The method of claim 1 , adapted for removing copper or copper-containing species from the metallized surface.
8. The method of claim 1 , adapted for removing tantalum or tantalum-containing species from the metallized surface.
9. The method of claim 1 , adapting for selectively removing one or more metals and/or metal-containing species from a metallized surface comprising a multiple metals or metal-containing species.
10. The method of claim 1 , comprising electrochemically forming the metal cations.
11. A method for polishing a metallized surface of a substrate, the method comprising:
positioning the substrate at a height so that the metallized surface is above and opposes a polymeric surface of a polymeric substrate;
forming metal cations from metal or metal-containing species on the metallized surface;
providing an aqueous solution to form a latent boundary layer released from the polymeric surface when a downward force is applied to the polymeric substrate;
controlling contact of the latent boundary layer and the metallized surface by adjusting the height of the substrate above the polymeric surface of the polymeric substrate; and
transporting solvated metal cations across a first interface to extract the metal cations from the aqueous solution with an organic phase.
12. The method of claim 11 , wherein the polymeric surface of the polymeric substrate is porous, and at least one of the aqueous solution and the organic phase is capable of permeating the porous polymeric surface.
13. The method of claim 11 , adapted for removing copper or copper-containing species from the metallized surface.
14. The method of claim 11 , adapted for removing tantalum or tantalum-containing species from the metallized surface.
15. The method of claim 11 , comprising electrochemically forming the metal cations.
16. The method of claim 11 , comprising complexing the solvated metal cations with a complexing agent to transport the solvated metal cations across the first interface to enter the organic phase as a metal-containing complex.
17. The method of claim 16 , further comprising transporting the metal-containing complex across a second interface to enter an aqueous phase internal to the organic phase.